Refer to The International Journal of Pavement Engineering (Sept. 2004) field study of concrete stress at a newly constructed highway, Exercise 8.51. The variable of interest was slab top transverse strain (i.e., change in length per unit length per unit time) at a distance of 1 meter from the longitudinal joint. The 5-hour changes (8:20 P.M. to 1:20 A.M.) in slab top transverse strain for six days are reproduced in the next table. Analyze the data using a nonparametric test. Is there a shift in the change in transverse strain distributions between field measurements and the 3D model? Test using α = .05.

Data from Exercise 8.51

Civil engineers at West Virginia University have developed a 3D model to predict the response of jointed concrete pavement to temperature variations. (The International Journal of Pavement Engineering, Sept. 2004.) To validate the model, model predictions were compared to field measurements on key concrete stress variables taken at a newly constructed highway. One variable measured was slab top transverse strain (i.e., change in length per unit length per unit time) at a distance of 1 meter from the longitudinal joint. The 5-hour changes (8:20 P.M. to 1:20 A.M.) in slab top transverse strain for 6 days.

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SLABSTRAIN Change in Transverse Strain Change in Temperature (°C) Field Day Measurement 3D Model Oct. 24 -6.3 -58 -52 Dec. 3 13.2 69 59 Dec. 15 3.3 35 32 Feb. 2 -14.8 -32 -24 Mar. 25 1.7 -40 -39 May 24 -.2 -83 -71